CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 1,699	$ 10,324
Adjustments to reconcile net income to cash provided by (used in) operating activities
Stock-based compensation	5,811	5,101
Depreciation and amortization	3,075	3,803
Right of use asset depreciation	1,223	1,143
(Accretion) amortization of premiums and discounts on investments	(613)	647
Deferred income taxes	(920)	207
Other non-cash adjustments	241	235
Changes in operating assets and liabilities:
Accounts receivable, net	10,756	2,208
Contract assets	1,720	(398)
Inventories, net	(5,745)	(11,848)
Prepaid and other assets	(1,292)	(461)
Accounts payable	1,043	1,121
Accrued expenses and other liabilities	(4,966)	(4,617)
Contract liabilities	240	(1,197)
Net cash provided by operating activities	12,272	6,268
Cash flows from investing activities:
Sales of marketable securities	2,966	0
Maturities of marketable securities	58,705	34,107
Purchases of marketable securities	(78,949)	(35,964)
Capital expenditures	(1,179)	(2,999)
Proceeds from sales of fixed assets	82	734
Net cash used in investing activities	(18,375)	(4,122)
Cash flows from financing activities:
Net proceeds from issuance of common stock	1,184	2,244
Repurchase of common stock	0	(26,654)
Net cash provided by (used in) financing activities	1,184	(24,410)
Effect of exchange rate differences on cash and cash equivalents	27	38
Net change in cash, cash equivalents and restricted cash	(4,892)	(22,226)
Cash, cash equivalents and restricted cash, beginning of year	56,458	74,461
Cash, cash equivalents and restricted cash, end of period	$ 51,566	$ 52,235