Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities
Net income (loss)	$ (2,321)	$ 3,793
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Deferred taxes	(817)	590
Stock-based compensation	1,940	1,605
Depreciation and amortization	931	894
Changes in inventory reserve	549	40
Other	276	126
Changes in operating assets and liabilities:
Accounts receivable	(1,434)	(731)
Inventories, net	(596)	(1,438)
Contract assets	(1,112)	(2,820)
Prepaid expenses and other assets	30	650
Accounts payable	2,655	502
Accrued expenses and other liabilities	(4,862)	1,136
Deferred revenue	(120)	(2,369)
Net cash provided by (used in) operating activities	(4,881)	1,978
Cash Flows from Investing Activities
Purchases of property and equipment	(81)	(1,184)
Proceeds from maturities of investment securities	996	0
Purchases of investment securities	(249)	0
Net cash provided by (used in) investing activities	666	(1,184)
Cash Flows from Financing Activities
Principal payments on long-term debt	(375)	0
Proceeds from exercise of stock options	913	3,341
Taxes paid related to net share settlement of equity awards	(521)	(1,619)
Net cash provided by (used in) financing activities	17	1,722
Effect of exchange rate changes on cash and cash equivalents	0	(1)
Increase (decrease) in cash and cash equivalents	(4,198)	2,515
Cash and cash equivalents
Beginning of period	65,913	53,137
End of period	61,715	55,652
Supplemental disclosure of cash flow information
Cash paid for interest	148	850
Cash paid for income taxes	0	98
Supplemental disclosure of non-cash investing activities
Purchases of property and equipment recorded in accounts payable and accrued expenses	$ 632	$ 1,779