Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 70,791	$ 78,889
Accounts receivable, net	50,573	36,868
Inventories, net	113,853	109,408
Prepaid expenses and other current assets	5,512	4,792
Total current assets	240,729	229,957
Property, plant and equipment, net	30,840	30,031
Long-term restricted cash	6,864	6,936
Other assets	23,798	14,860
Total assets	302,231	281,784
Current liabilities:
Accounts payable	24,996	19,849
Accrued compensation	5,142	9,059
Warranty	2,426	3,363
Income taxes	240	143
Deferred revenue	10,335	7,863
Other current liabilities	4,592	4,091
Total current liabilities	47,731	44,368
Sale leaseback obligation	47,586	47,586
Long-term deferred revenue	674	679
Other long-term liabilities	4,785	5,387
Total liabilities	100,776	98,020
Commitments and contingencies (Note 17)
Stockholders' equity
Preferred stock, $0.001 par value, 30,000 shares authorized; none issued or outstanding
Common stock, $0.001 par value, 75,000 shares authorized; 29,518 shares issued and outstanding at December 31, 2016; 29,025 shares issued and 28,995 shares outstanding at December 31, 2015	30	29
Additional paid-in capital	535,408	529,089
Treasury stock, at cost, no shares at December 31, 2016 and 30 shares at December 31, 2015		(1,218)
Accumulated deficit	(331,704)	(342,705)
Accumulated other comprehensive loss	(2,279)	(1,431)
Total stockholders' equity	201,455	183,764
Total liabilities and stockholders' equity	$ 302,231	$ 281,784