Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Net income	$ 26,703	$ 18,872
Adjustments to reconcile consolidated net income to net cash (used in) provided by operating activities:
Depreciation and amortization	3,737	2,948
Stock-based compensation	10,230	9,139
Loss on non-marketable equity investments	0	2,181
Inventory write-downs	1,668	670
Deferred taxes	(1,721)	(7,514)
Change in fair value of contingent consideration	0	725
Other	603	388
Changes in operating assets and liabilities:
Accounts receivable	(17,552)	(16,297)
Inventories	(18,521)	(3,948)
Prepaid expenses and other current and non-current assets	(3,812)	1,405
Accounts payable	415	625
Accrued expenses and other non-current liabilities	(1,915)	1,638
Net cash (used in) provided by operating activities	(165)	10,832
CASH FLOWS FROM INVESTING ACTIVITIES:
Contributions to non-marketable investments	0	(868)
Purchases of marketable investments	(29,550)	(61,495)
Proceeds from sales of marketable investments	2,700	236
Proceeds from maturities of marketable investments	50,800	77,869
Purchases of property and equipment	(6,208)	(5,105)
Other	(1,000)	0
Net cash provided by investing activities	16,742	10,637
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercises of stock options	2,265	3,171
Proceeds from issuance of stock under employee stock purchase plan	4,779	3,584
Payment of employee taxes related to vested common and restricted stock	(13,379)	(13,845)
Payment of asset acquisition-related and business acquisition-related obligations (Note 5)	(1,183)	(4,431)
Proceeds from capital contribution from non-controlling interest	500	0
Proceeds from capital contribution from non-controlling interest	0	(415)
Net cash used in financing activities	(7,018)	(11,936)
Effect of foreign exchange rate changes on cash and cash equivalents	(148)	(465)
NET INCREASE IN CASH AND CASH EQUIVALENTS	9,411	9,068
CASH AND CASH EQUIVALENTS—Beginning of period	67,850	50,637
CASH AND CASH EQUIVALENTS—End of period	77,261	59,705
NONCASH INVESTING AND FINANCING ACTIVITIES:
Common shares issued as consideration in connection with a buyout agreement (Notes 9 and 10)	0	5,256
Purchase of property and equipment funded through accounts payable and accrued liabilities	$ 1,290	$ 1,126

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Amount of cash inflow (outflow) from financing activities classified as other.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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