Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
OPERATING ACTIVITIES:
Net income (loss)			$ (38,769)	$ 2,410
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation			6,804	2,937
Depreciation and amortization			7,464	5,144
Loss on impairment	$ 10,542		10,542
Other non-cash amortization			313	380
Provision for doubtful accounts			(152)	747
Inventory reserve			1,989	1,168
Unrealized foreign currency gain			(62)	(364)
Interest expense on finance leases	23	$ 21	55	35
Deferred income taxes			361	(218)
Loss on disposal of fixed assets			718
Change in the estimated fair value of acquisition-related contingent consideration		(220)	(36)	(1,026)
Payment of acquisition-related contingent consideration				(142)
Changes in assets and liabilities
Accounts receivable			(18,646)	3,680
Inventories			(20,385)	(17,233)
Prepaid expenses and other assets			(4,416)	154
Accounts payable			11,942	4,400
Deferred revenue			(252)	(630)
Accrued expenses and other liabilities			(2,959)	(4,914)
Net cash used in operating activities			(45,489)	(3,472)
INVESTING ACTIVITIES:
Purchases of investments				(10,428)
Proceeds from maturities and redemptions of investments			23,017	43,745
Purchases of property and equipment	(5,221)	(11,868)	(25,440)	(22,929)
Purchase of property and equipment under government contracts	(5,615)		(33,803)
Proceeds from funding under government contract			33,962		$ 531
Other investing activities				(18)
Net cash (used in) provided by investing activities			(2,264)	10,370
FINANCING ACTIVITIES:
Cash payments for lease liabilities	(239)	(228)	(392)	(510)
Proceeds from exercise of stock options			15	121
Payment of acquisition-related contingent consideration			(208)	(264)
Repurchase of common stock			(1,954)	(1,877)
Net cash used in financing activities			(2,539)	(2,530)
EFFECT OF FOREIGN EXCHANGE RATE CHANGES ON CASH			(311)	(7,050)
NET DECREASE IN CASH AND CASH EQUIVALENTS			(50,603)	(2,682)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			116,762	160,802	160,802
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 66,159	$ 158,120	66,159	158,120	$ 116,762
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for income taxes			9,107	10,329
Non-cash investing and financing activities
Accrued property and equipment purchases			1,900	896
Accrued property and equipment purchases under government contracts			2,023
Unrealized gain (loss) on marketable securities			$ 156	$ (101)