Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts of $1,255 and $1,254 as of March 31, 2019 and December 31, 2018, respectively	$ 1,255	$ 1,254
Current assets:
Cash and cash equivalents	185,680	201,047
Short-term investments	26,972	73,317
Accounts receivable, net of allowance for doubtful accounts of $1,255 and $1,254 as of March 31, 2019 and December 31, 2018, respectively	262,531	303,667
Inventories	236,123	243,871
Prepaid expenses and other current assets	34,791	35,997
Total current assets	746,097	857,899
Property and equipment, net	20,645	20,177
Operating lease right-of-use assets, net	36,613
Intangibles, net	15,058	17,146
Goodwill	80,721	80,721
Other non-current assets	71,241	67,433
Total assets	970,375	1,043,376
Current liabilities:
Accounts payable	69,279	139,748
Accrued employee compensation	18,452	31,666
Other accrued liabilities	177,635	199,472
Deferred revenue	11,750	11,086
Income taxes payable	2,895	2,020
Total current liabilities	280,011	383,992
Non-current income taxes payable	18,142	19,600
Non-current operating lease liabilities	31,514
Other non-current liabilities	7,800	12,232
Total liabilities	337,467	415,824
Commitments and contingencies (Note 10)
Stockholders’ equity:
Common stock	32	32
Additional paid-in capital	804,413	793,585
Accumulated other comprehensive income (loss)	14	(15)
Accumulated deficit	(171,551)	(166,050)
Total stockholders’ equity	632,908	627,552
Total liabilities and stockholders’ equity	$ 970,375	$ 1,043,376