Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (4,264)	$ (6,761)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,479	3,133
Non-cash interest expense	1,257	1,462
Depreciation expense	1,792	1,436
Amortization of intangible assets	221	646
Changes in operating assets and liabilities:
Accounts receivable	(2,211)	(3,395)
Contract asset	(369)	336
Inventory	(553)	2,976
Prepaid expenses and other assets	1,134	110
Accrued interest	(2,274)	0
Accrued payroll	(3,323)	34
Accounts payable, accrued expenses and other liabilities	(969)	(66)
Net cash used in operating activities	(8,080)	(89)
Cash flows from investing activities:
Purchases of property and equipment	(1,708)	(1,477)
Net cash used in investing activities	(1,708)	(1,477)
Cash flows from financing activities:
Payment of costs for issuance of common stock	(16)	0
Cash portion of $16,160 reduction to debt principal and accrued exit fee	0	(10,100)
Payment of financing costs	(36)	(200)
Net payments related to vesting of restricted stock units	(101)	(336)
Net cash used in financing activities	(153)	(10,636)
Net decrease in cash and cash equivalents	(9,941)	(12,202)
Cash and cash equivalents, beginning of period	25,217	23,760
Cash and cash equivalents, end of period	15,276	11,558
Supplemental disclosures of cash flow information:
Cash paid for interest	4,676	2,495
Purchases of property, plant and equipment included in accrued expenses and accounts payable	774	132
Issuance of common stock to reduce debt principal and accrued exit fees	0	6,060
Issuance of common stock to settle interest obligations	$ 0	$ 3,211