Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 49,387	$ 58,293	$ 25,791
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	13,906	18,931	19,406
Stock-based compensation	25,995	30,505	29,137
Gain/loss on investments, net	1,362	6,222	224
Change in fair value of contingent consideration	(3,003)	(2,928)	(25)
Deferred income taxes	4,498	(9,386)	(1,379)
Provision for excess and obsolete inventory	3,877	7,872	3,878
Other	0	74	(170)
Changes in assets and liabilities:
Accounts receivable, net	75,894	(59,885)	26,500
Inventories	(147,432)	55,505	4,504
Prepaid expenses and other assets	(4,127)	4,833	(1,654)
Accounts payable	(16,493)	9,744	(56,614)
Accrued employee compensation	(10,316)	15,718	(11,642)
Other accrued liabilities	4,869	28,194	(16,603)
Deferred revenue	2,978	8,112	(3,354)
Income taxes payable	(5,974)	9,346	(4,474)
Net cash provided by (used in) operating activities	(4,579)	181,150	13,525
Cash flows from investing activities:
Purchases of short-term investments	(146)	(305)	(1,617)
Proceeds from maturities of short-term investments	710	290	70,790
Purchases of property and equipment	(9,864)	(10,296)	(14,230)
Purchases of long-term investments	(685)	(6,525)	(5,484)
Net cash provided by (used in) investing activities	(9,985)	(16,836)	49,459
Cash flows from financing activities:
Repurchases of common stock	(75,000)	(23,800)	(75,946)
Restricted stock unit withholdings	(7,660)	(5,090)	(6,521)
Proceeds from exercise of stock options	9,620	16,950	5,027
Proceeds from issuance of common stock under employee stock purchase plan	4,916	3,878	3,617
Net cash used in financing activities	(68,124)	(8,062)	(73,823)
Net increase (decrease) in cash and cash equivalents	(82,688)	156,252	(10,839)
Cash and cash equivalents, at beginning of period	346,460	190,208	201,047
Cash and cash equivalents, at end of period	263,772	346,460	190,208
Supplemental Cash Flow Information:
Cash paid for income taxes, net	20,589	8,218	8,876
Non-cash investing and financing activities:
Unpaid property and equipment	$ 526	$ 1,273	$ 426