CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 19,318	$ 6,494
Short-term investments	89,494	89,268
Accounts receivable, net	16,948	14,305
Inventory, net	8,966	6,844
Prepaid expenses and other current assets	2,495	3,032
Restricted cash		80
Total current assets	137,221	120,023
Property and equipment, net	10,535	7,593
Intangible asset, net	4,088	6,567
Deposits and other assets	767	188
Total assets	152,611	134,371
Current liabilities:
Accounts payable	3,558	2,967
Accrued liabilities	16,157	13,911
Deferred rent	92	60
Total current liabilities	19,807	16,938
Other liabilities	703	159
Total liabilities	20,510	17,097
Commitments and contingencies (see Note 8)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000 shares authorized, no shares issued or outstanding
Common stock, $0.001 par value; 150,000 shares authorized, 34,582 and 33,971 shares issued and 34,554 and 33,943 shares outstanding at September 30, 2017 and December 31, 2016, respectively	35	34
Additional paid-in capital	325,701	308,815
Accumulated other comprehensive (loss) income	(314)	648
Accumulated deficit	(193,189)	(192,091)
Less treasury stock (28 shares as of September 30, 2017 and December 31, 2016)	(132)	(132)
Total stockholders' equity	132,101	117,274
Total liabilities and stockholders' equity	$ 152,611	$ 134,371