CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 8,621	$ 6,494
Short-term investments	90,590	89,268
Accounts receivable, net	14,434	14,305
Inventory, net	7,485	6,844
Prepaid expenses and other current assets	2,579	3,032
Restricted cash	30	80
Total current assets	123,739	120,023
Property and equipment, net	7,839	7,593
Intangible asset, net	5,970	6,567
Deposits and other assets	354	188
Total assets	137,902	134,371
Current liabilities:
Accounts payable	3,934	2,967
Accrued liabilities	10,623	13,911
Deferred rent	85	60
Total current liabilities	14,642	16,938
Other liabilities	307	159
Total liabilities	14,949	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, 34,308 and 33,971 shares issued and 34,280 and 33,943 shares outstanding at March 31, 2017 and December 31, 2016, respectively	34	34
Additional paid-in capital	313,916	308,815
Accumulated other comprehensive income	348	648
Accumulated deficit	(191,213)	(192,091)
Less treasury stock (28 shares as of March 31, 2017 and December 31, 2016)	(132)	(132)
Total stockholders' equity	122,953	117,274
Total liabilities and stockholders' equity	$ 137,902	$ 134,371