Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 67,571	$ 78,889
Accounts receivable, net	47,471	36,868
Inventories, net	115,165	115,904
Prepaid expenses and other current assets	6,106	4,792
Total current assets	236,313	236,453
Property, plant and equipment, net	30,997	30,031
Long-term restricted cash	6,863	6,936
Other assets	19,161	14,860
Total assets	293,334	288,280
Current liabilities
Accounts payable	21,700	19,849
Accrued compensation	8,477	9,059
Warranty	3,288	3,363
Income taxes	177	143
Deferred revenue	8,119	7,863
Other current liabilities	4,153	4,091
Total current liabilities	45,914	44,368
Sale leaseback obligation	47,586	47,586
Long-term deferred revenue	667	679
Other long-term liabilities	4,852	5,387
Total liabilities	$ 99,019	$ 98,020
Commitments and contingencies (Note 12)
Stockholders' equity
Preferred stock, $0.001 par value, 30,000 shares authorized; none issued or outstanding
Common stock, $0.001 par value, 300,000 shares authorized; 116,357 shares issued and 116,237 shares outstanding at March 31, 2016; 116,101 shares issued and 115,981 shares outstanding at December 31, 2015	$ 116	$ 116
Additional paid-in capital	530,034	529,002
Treasury stock, at cost, 120 shares at March 31, 2016 and December 31, 2015	(1,218)	(1,218)
Accumulated deficit	(334,261)	(336,209)
Accumulated other comprehensive loss	(356)	(1,431)
Total stockholders' equity	194,315	190,260
Total liabilities and stockholders' equity	$ 293,334	$ 288,280