Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 51,266	$ 42,845
Short-term investments	213,281	226,467
Accounts receivable, net of allowance for doubtful accounts of $824 and $1,333 at December 31, 2018 and 2017, respectively	80,656	67,287
Inventories	92,035	98,119
Prepaid expenses and other current assets	6,621	6,463
Total current assets	443,859	441,181
Property and equipment, net	12,801	8,819
Other assets	5,850	3,250
Restricted cash	606	806
Total assets	463,116	454,056
Current liabilities
Accounts payable	23,505	18,492
Accrued liabilities	38,790	39,390
Other current liabilities	119	122
Total current liabilities	62,414	58,004
Long-term debt	152,394	145,019
Other long-term liabilities	2,825	1,861
Total liabilities	217,633	204,884
Commitments and contingencies (Note 6)
Stockholders’ equity
Preferred stock, $0.001 par value, 10,000,000 shares authorized at December 31, 2018 and 2017, respectively; zero shares issued and outstanding at December 31, 2018 and 2017, respectively
Common stock, $0.001 par value, 290,000,000 shares authorized at December 31, 2018 and 2017, respectively; 30,263,536 and 29,737,561 shares issued and outstanding at December 31, 2018 and 2017, respectively	30	30
Additional paid-in capital	552,612	508,228
Accumulated other comprehensive loss	(1,077)	(1,242)
Accumulated deficit	(306,082)	(257,844)
Total stockholders’ equity	245,483	249,172
Total liabilities and stockholders’ equity	$ 463,116	$ 454,056