Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 140,957	$ 133,407
Short-term restricted cash	770	750
Accounts receivable, net	75,588	75,302
Inventories, net	135,005	120,544
Prepaid expenses and other current assets	9,277	9,772
Total current assets	361,597	339,775
Property, plant and equipment, net	36,203	36,168
Long-term restricted cash	6,744	6,723
Deferred income taxes	80,697	83,148
Other assets	19,903	22,404
Total assets	505,144	488,218
Current liabilities:
Accounts payable	43,438	32,642
Accrued compensation	7,685	20,955
Warranty	4,583	4,112
Income taxes	389	273
Deferred revenue	15,507	16,181
Other current liabilities	5,482	5,124
Total current liabilities	77,084	79,287
Sale leaseback obligation	47,724	47,714
Long-term deferred revenue	3,015	1,964
Other long-term liabilities	5,794	5,643
Total liabilities	133,617	134,608
Commitments and contingencies (Note 13)
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,142 shares issued and outstanding at March 31, 2018; 32,048 shares issued and outstanding at December 31, 2017	32	32
Additional paid-in capital	557,498	556,147
Accumulated deficit	(189,230)	(204,745)
Accumulated other comprehensive income	3,227	2,176
Total stockholders' equity	371,527	353,610
Total liabilities and stockholders' equity	$ 505,144	$ 488,218