CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 129,663	$ 122,233
Marketable securities	12,180	19,547
Accounts receivable, less reserve for doubtful accounts of $32 at March 31, 2017 and $23 at December 31, 2016	17,710	15,194
Other receivables	669	839
Inventories	23,957	24,696
Prepaid expenses and other current assets	1,620	1,644
Total current assets	185,799	184,153
Property, plant and equipment, net	15,373	14,956
Intangible assets, net	29,222	29,806
Goodwill	59,784	59,548
Restricted cash	450	450
Total assets	290,628	288,913
Current liabilities:
Accounts payable	4,635	5,061
Accrued liabilities	9,116	16,014
Total current liabilities	13,751	21,075
Convertible senior notes	96,242	95,272
Deferred tax liabilities	2,188	2,103
Other long-term liabilities	1,656	1,699
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $.01 par value, 80,000,000 shares authorized, 34,076,544 shares at March 31, 2017 and 33,844,074 shares at December 31, 2016 issued and outstanding	341	338
Additional paid-in capital	245,961	242,036
Accumulated other comprehensive loss	(12,718)	(13,749)
Accumulated deficit	(56,793)	(59,861)
Total stockholders' equity	176,791	168,764
Total liabilities and stockholders' equity	$ 290,628	$ 288,913