Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 136,340	$ 177,993
Short-term restricted cash	149
Accounts receivable, net	62,279	78,727
Inventories, net	135,141	129,000
Prepaid expenses and other current assets	11,448	11,051
Total current assets	345,357	396,771
Property, plant and equipment, net	24,326	41,149
Operating lease assets	6,431
Finance lease assets, net	22,563
Long-term restricted cash	6,675	6,909
Deferred income taxes	70,598	71,939
Other assets	41,132	31,673
Total assets	517,082	548,441
Current liabilities:
Accounts payable	21,771	35,955
Accrued compensation	7,695	19,218
Warranty	4,045	4,819
Income taxes	329	462
Deferred revenue	10,176	19,513
Current portion of finance lease obligation	108
Other current liabilities	7,960	5,030
Total current liabilities	52,084	84,997
Finance lease obligation	48,441	47,757
Long-term deferred revenue	3,904	3,071
Other long-term liabilities	7,187	4,279
Total liabilities	111,616	140,104
Commitments and contingencies (Note 15)
Stockholders' equity:
Common stock, $0.001 par value, 75,000 shares authorized; 32,297 shares issued and outstanding at June 30, 2019; 32,558 shares issued and outstanding at December 31, 2018	32	33
Additional paid-in capital	556,283	565,116
Accumulated deficit	(150,642)	(157,260)
Accumulated other comprehensive (loss) income	(207)	448
Total stockholders' equity	405,466	408,337
Total liabilities and stockholders' equity	$ 517,082	$ 548,441