Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Net income (loss)	$ 46,289	$ 56,201	$ (2,027)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred taxes	13,939	(47,203)	(371)
Stock-based compensation	8,015	7,948	6,470
Depreciation and amortization	3,901	2,627	2,557
Non-cash interest expense	648	504	405
Increase in inventory reserve	152	511	325
Gain on sale of assets	(38,591)	0	0
Other	671	42	12
Changes in operating assets and liabilities:
Accounts receivable	(14,476)	(7,128)	(16,095)
Inventories, net	2,748	(2,728)	(4,975)
Contract assets	110	53	(2,793)
Prepaid expenses and other current assets	(1,056)	(1,460)	(655)
Accounts payable	2,189	2,594	926
Accrued expenses and other liabilities	11,596	7,157	4,888
Deferred revenue	484	2,202	718
Net cash provided by (used in) operating activities	36,619	21,320	(10,615)
Cash Flows from Investing Activities
Purchases of property and equipment	(6,617)	(9,615)	(2,350)
Proceeds from sale of assets, net of transaction costs	17,825	282	5,000
Purchase of intangibles, including transaction costs	(13,815)	(5,000)	0
Purchases of investment securities	(1,245)	0	(22,645)
Proceeds from maturities of investment securities	0	22,500	0
Net cash provided by (used in) investing activities	(3,852)	8,167	(19,995)
Cash Flows from Financing Activities
Proceeds from issuance of long-term debt	20,000	0	15,000
Principal payments of long-term debt	(40,000)	0	0
Prepayment fees and end of term charge on long-term debt	(2,055)	0	0
Payment of debt issuance costs for long-term debt	(276)	0	(136)
Proceeds from issuance of common stock, net	0	0	7,781
Proceeds from exercise of stock options	5,182	1,814	4,405
Taxes paid related to net share settlement of equity awards	(2,841)	(1,367)	(1,131)
Net cash provided by (used in) financing activities	(19,990)	447	25,919
Effect of exchange rate changes on cash and cash equivalents	(1)	2	0
Cash and cash equivalents
Net increase (decrease) during the period	12,776	29,936	(4,691)
Beginning of period	53,137	23,201	27,892
End of period	65,913	53,137	23,201
Supplemental disclosure of cash flow information
Cash paid for interest	2,736	3,538	3,025
Cash paid for income taxes	1,783	90	0
Supplemental disclosure of non-cash investing activities
Purchases of property and equipment recorded in accounts payable and accrued expenses	259	2,017	970
Purchase of intangible assets included in accrued liabilities	0	2,500	0
Gain on sale of assets recognized in excess of cash received	$ 20,766	$ 0	$ 0