Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (1,775)	$ (1,845)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization	6,286	5,683
Noncash operating lease expense	3,799
Impairment of goodwill	4,359	0
Provision for doubtful accounts	95	64
Stock-based compensation expense	1,766	2,159
Loss on debt modification	0	335
Loss on debt extinguishment	513	0
Amortization of debt discount and issuance costs	1,392	373
Deferred tax benefit	(609)	(745)
Change in fair value of warrant liability	(588)	0
Gain on embedded derivative	(388)	0
Gain on sale of property and equipment	(57)	(90)
Changes in operating assets and liabilities:
Accounts receivable	659	(6,408)
Contract assets	(13,378)
Costs and estimated earnings in excess of billings on uncompleted contracts		308
Other current assets	30,139	(31,162)
Other assets	0	0
Accounts payable, including retainage	11,914	6,914
Contract liabilities	(6,446)	0
Billings in excess of costs and estimated earnings on uncompleted contracts		22,301
Prepaid income taxes	58	(2,753)
Accrued taxes payable	12	0
Accrued expenses and other current liabilities	(34,686)	29,535
Operating lease liabilities	(3,654)
Other long-term liabilities	(337)	653
Net cash provided by (used in) operating activities	(926)	25,322
Cash flows from investing activities:
Proceeds from sale of property and equipment	168	198
Advances to joint ventures	4	(1)
Purchase of property and equipment	(2,663)	(3,877)
Net cash used in investing activities	(2,491)	(3,680)
Cash flows from financing activities:
Bank overdrafts	(1,333)	(6,446)
Payments on Credit Agreement term loan	(14,335)	(3,300)
Proceeds from Credit Agreement revolver	17,500	109,650
Payments on Credit Agreement revolver	(17,500)	(115,308)
Proceeds from 2019 Revolving Credit Facility	32,500	0
Payments on 2019 Revolving Credit Facility	(32,500)	0
Proceeds from 2019 Refinancing Term Loan, net of debt discount	38,644
Warrants issued in conjunction with the 2019 Refinancing Term Loan	969
Embedded derivative associated with the 2019 Refinancing Term Loan	388
Proceeds from Bridge Term Loan	0	10,000
Payments on Bridge Term Loan	(7,736)	(2,264)
Payments on finance leases	(2,547)
Payments on finance leases		(1,939)
Convertible preferred stock redeemed	0	(9,191)
Convertible preferred stock dividends paid	0	(875)
Taxes paid related to net-share settlement of equity awards	(131)	(211)
Payments of debt issuance costs	(3,777)	(765)
Net cash provided by (used in) financing activities	10,142	(20,649)
Increase in cash, cash equivalents and restricted cash	6,725	993
Cash, cash equivalents and restricted cash, beginning of year	1,732	739
Cash, cash equivalents and restricted cash, end of year	8,457	1,732
Noncash investing and financing transactions:
Debt issuance costs related to 2019 Refinancing Agreement paid-in-kind	1,000	0
Property and equipment acquired financed with capital leases	0	3,260
Right of use assets obtained in exchange for new operating lease liabilities	3,355
Right of use assets obtained in exchange for new finance lease liabilities	3,578
Right of use assets disposed or adjusted modifying operating leases liabilities	1,651
Right of use assets disposed or adjusted modifying finance leases liabilities	(78)
Interest paid	$ 4,607	$ 2,714