CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 106,237	$ 29,144
Accounts receivable, net of allowances of $2,138 and $2,378 at December 31, 2018 and December 31, 2017, respectively	78,938	65,346
Inventory	16,267	25,999
Prepaid expenses and other assets	20,860	9,957
Total current assets	222,302	130,446
Property and equipment, net	20,998	26,483
Intangible assets, net	35,306	515
Goodwill	24,783	3,664
Other assets	36,548	8,039
Total assets	339,937	169,147
Current liabilities:
Accounts payable	48,794	28,747
Accrued liabilities	29,010	22,447
Deferred revenues, current	33,119	15,691
Warranty obligations, current (includes $4,288 and $2,240 measured at fair value at December 31, 2018 and December 31, 2017, respectively)	8,083	7,427
Debt, current	28,155	17,429
Total current liabilities	147,161	91,741
Long-term liabilities:
Deferred revenues, noncurrent	76,911	29,941
Warranty obligations, noncurrent (includes $7,469 and $7,551 measured at fair value at December 31, 2018 and December 31, 2017, respectively)	23,211	22,389
Other liabilities	3,250	1,880
Debt, noncurrent	81,628	32,322
Total liabilities	332,161	178,273
Commitments and contingent liabilities (Note 12)
Stockholders’ equity (deficit):
Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value, 150,000 shares and 125,000 shares authorized; and 107,035 and 85,914 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	1	1
Additional paid-in capital	353,335	287,256
Accumulated deficit	(346,302)	(295,727)
Accumulated other comprehensive income (loss)	742	(656)
Total stockholders’ equity (deficit)	7,776	(9,126)
Total liabilities and stockholders’ equity (deficit)	$ 339,937	$ 169,147