Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 6,782,573	$ 12,430,287
Accounts receivable, net of allowances for expected credit losses of $445,683 and $389,079, respectively	4,199,469	4,280,991
Inventories, net	12,027,655	10,949,697
Unbilled revenue	138,020	138,020
Prepaid and other current assets	874,627	1,086,310
Total current assets	24,022,344	28,885,305
Property, plant and equipment, net	1,530,309	1,609,321
Right-of-use assets - operating leases, net	1,241,494	1,490,094
Right-of-use assets - finance leases	1,514,653	1,434,080
Intangible assets, net	1,968,132	2,146,503
Goodwill	1,248,442	1,248,442
Other assets	79,065	176,358
TOTAL ASSETS	31,604,439	36,990,103
Current liabilities:
Accounts payable	3,069,563	3,381,545
Accrued expenses	2,686,971	2,814,150
Deferred revenue, current portion	967,604	1,530,977
Operating lease obligations, current portion	478,847	538,641
Finance lease obligations, current portion	332,087	280,265
Acquisition liabilities, current portion	633,382	677,162
Unfavorable contract liability, current portion	41,043	44,433
Total current liabilities	8,209,497	9,267,173
Long-term liabilities:
Deferred revenue, net of current portion	3,208,904	3,265,886
Operating lease obligations, net of current portion	816,410	1,004,488
Finance lease obligations, net of current portion	989,519	992,285
Acquisition liabilities, net of current portion	687,345	826,757
Unfavorable contract liability, net of current portion	140,381	160,902
Total liabilities	14,052,056	15,517,491
Commitments and contingencies
Tecogen Inc. shareholders’ equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 30,179,072 issued and outstanding at June 30, 2026 and 29,846,479 shares issued and outstanding at December 31, 2025	30,180	29,847
Additional paid-in capital	79,804,451	78,216,467
Unearned compensation	(1,958,492)	(712,019)
Accumulated deficit	(60,157,825)	(55,888,649)
Total Tecogen Inc. stockholders’ equity	17,718,314	21,645,646
Noncontrolling interest	(165,931)	(173,034)
Tecogen Inc. stockholders’ equity:	17,552,383	21,472,612
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 31,604,439	$ 36,990,103

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities, Current

No definition available.

Name:	tgen_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilitiesCurrent
Namespace Prefix:	tgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).