Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 133,407	$ 70,791
Short-term restricted cash	750
Accounts receivable, net	75,302	50,573
Inventories, net	120,544	113,853
Prepaid expenses and other current assets	9,772	5,512
Total current assets	339,775	240,729
Property, plant and equipment, net	36,168	30,840
Long-term restricted cash	6,723	6,864
Deferred income taxes	83,148	1,060
Other assets	22,404	22,738
Total assets	488,218	302,231
Current liabilities:
Accounts payable	32,642	24,996
Accrued compensation	20,955	5,142
Warranty	4,112	2,426
Income taxes	273	240
Deferred revenue	16,181	10,335
Other current liabilities	5,124	4,592
Total current liabilities	79,287	47,731
Sale leaseback obligation	47,714	47,586
Long-term deferred revenue	1,964	674
Other long-term liabilities	5,643	4,785
Total liabilities	134,608	100,776
Commitments and contingencies (Note 14)
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,048 shares issued and outstanding at December 31, 2017; 29,518 shares issued and outstanding at December 31, 2016	32	30
Additional paid-in capital	556,147	535,408
Accumulated deficit	(204,745)	(331,704)
Accumulated other comprehensive income (loss)	2,176	(2,279)
Total stockholders' equity	353,610	201,455
Total liabilities and stockholders' equity	$ 488,218	$ 302,231