Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Cash Flows [Abstract]
Consolidated net income	$ 79	$ 10,926
Adjustments to reconcile consolidated net income to net cash used in operating activities:
Depreciation and amortization	5,726	3,471
Stock-based compensation	8,893	6,395
Inventory write-downs	593	991
Deferred taxes	(4,378)	1,223
Other	(1,012)	886
Changes in operating assets and liabilities:
Accounts receivable	(8,710)	(12,943)
Inventories	(11,764)	(31,608)
Prepaid expenses and other current and non-current assets	(3,809)	(3,463)
Accounts payable	1,389	1,272
Accrued expenses and other non-current liabilities	8,249	8,482
Proceeds from lease incentives	230	0
Net cash provided by (used in) operating activities	(4,514)	(14,368)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable investments	0	(12,266)
Proceeds from maturities of marketable investments	20,668	19,497
Purchases of property and equipment	(4,957)	(3,991)
Other	0	(150)
Net cash provided by (used in) investing activities	15,711	3,090
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercises of stock options	1,102	666
Payment of employee taxes related to vested stock	(3,181)	(3,036)
Payments of finance lease obligations	(425)	(337)
Other	(137)	93
Net cash used in financing activities	(2,641)	(2,614)
Effect of foreign exchange rate changes on cash and cash equivalents	228	(146)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	8,784	(14,038)
CASH AND CASH EQUIVALENTS—Beginning of period	59,379	69,670
CASH AND CASH EQUIVALENTS—End of period	68,163	55,632
NONCASH INVESTING AND FINANCING ACTIVITIES:
Right-of-use assets obtained in exchange for lease obligations	47,678	803
Right-of-use assets obtained in exchange for finance lease obligations	81	428
Purchase of property and equipment funded through accounts payable and accrued liabilities	1,626	2,184
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for income taxes	$ 1,798	$ 132