Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts of $1,079 and $1,254 as of June 30, 2019 and December 31, 2018, respectively	$ 1,079	$ 1,254
Current assets:
Cash and cash equivalents	214,611	201,047
Short-term investments	3,700	73,317
Accounts receivable, net of allowance for doubtful accounts of $1,079 and $1,254 as of June 30, 2019 and December 31, 2018, respectively	238,635	303,667
Inventories	276,316	243,871
Prepaid expenses and other current assets	38,687	35,997
Total current assets	771,949	857,899
Property and equipment, net	21,074	20,177
Operating lease right-of-use assets, net	34,063	0
Intangibles, net	13,297	17,146
Goodwill	80,721	80,721
Other non-current assets	71,403	67,433
Total assets	992,507	1,043,376
Current liabilities:
Accounts payable	108,444	139,748
Accrued employee compensation	23,436	31,666
Other accrued liabilities	171,873	199,472
Deferred revenue	10,093	11,086
Income taxes payable	1,141	2,020
Total current liabilities	314,987	383,992
Non-current income taxes payable	18,278	19,600
Non-current operating lease liabilities	29,263	0
Other non-current liabilities	7,907	12,232
Total liabilities	370,435	415,824
Commitments and contingencies (Note 10)
Stockholders’ equity:
Common stock	31	32
Additional paid-in capital	812,034	793,585
Accumulated other comprehensive income (loss)	12	(15)
Accumulated deficit	(190,005)	(166,050)
Total stockholders’ equity	622,072	627,552
Total liabilities and stockholders’ equity	$ 992,507	$ 1,043,376