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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Cash Flows [Abstract]    
Consolidated net income $ 10,926 $ 888
Adjustments to reconcile consolidated net income to net cash used in operating activities:    
Depreciation and amortization 3,471 2,959
Stock-based compensation 6,395 5,689
Inventory write-downs 991 1,097
Deferred taxes 1,223 (1,502)
Other 886 168
Changes in operating assets and liabilities:    
Accounts receivable (12,943) (238)
Inventories (31,608) (15,090)
Prepaid expenses and other current and non-current assets (3,463) (1,544)
Accounts payable 1,272 921
Accrued expenses and other non-current liabilities 8,482 732
Net cash provided by (used in) operating activities (14,368) (5,920)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable investments (12,266) 0
Proceeds from sales of marketable investments 0 7,188
Proceeds from maturities of marketable investments 19,497 12,980
Purchases of property and equipment (3,991) (10,131)
Other (150) 0
Net cash provided by (used in) investing activities 3,090 10,037
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercises of stock options 666 396
Payment of employee taxes related to vested stock (3,036) (2,105)
Payments of finance lease obligations (337) (1,958)
Payment of acquisition-related obligations 0 (683)
Other 93 0
Net cash used in financing activities (2,614) (4,350)
Effect of foreign exchange rate changes on cash and cash equivalents (146) (90)
NET DECREASE IN CASH AND CASH EQUIVALENTS (14,038) (323)
CASH AND CASH EQUIVALENTS—Beginning of period 69,670 72,779
CASH AND CASH EQUIVALENTS—End of period 55,632 72,456
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Right-of-use assets obtained in exchange for lease obligations 803 325
Right-of-use assets obtained in exchange for finance lease obligations 428 0
Purchase of property and equipment funded through accounts payable and accrued liabilities $ 2,184 $ 1,702