CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 142,207	$ 122,233
Marketable securities	2,744	19,547
Accounts receivable, less reserve for doubtful accounts of $32 at June 30, 2017 and $23 at December 31, 2016	22,115	15,194
Other receivables	534	839
Inventories	26,085	24,696
Prepaid expenses and other current assets	2,260	1,644
Total current assets	195,945	184,153
Property, plant and equipment, net	15,996	14,956
Intangible assets, net	29,013	29,806
Goodwill	60,979	59,548
Restricted cash	450	450
Other assets	6,380
Total assets	308,763	288,913
Current liabilities:
Accounts payable	6,951	5,061
Accrued liabilities	9,568	16,014
Total current liabilities	16,519	21,075
Convertible senior notes	97,228	95,272
Deferred tax liabilities	2,457	2,103
Other long-term liabilities	1,616	1,699
Commitments and contingencies (Note 15)
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, 34,118,994 shares at June 30, 2017 and 33,844,074 shares at December 31, 2016 issued and outstanding	341	338
Additional paid-in capital	247,628	242,036
Accumulated other comprehensive loss	(8,671)	(13,749)
Accumulated deficit	(48,355)	(59,861)
Total stockholders' equity	190,943	168,764
Total liabilities and stockholders' equity	$ 308,763	$ 288,913