Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 29,144	$ 17,764
Accounts receivable, net of allowances of $2,378 and $2,921 at December 31, 2017 and 2016, respectively	65,346	61,019
Inventory	25,999	31,960
Prepaid expenses and other	9,957	7,121
Total current assets	130,446	117,864
Property and equipment, net	26,483	31,440
Goodwill	3,664	3,664
Intangibles, net	515	945
Other assets	8,039	9,663
Total assets	169,147	163,576
Current liabilities:
Accounts payable	28,747	31,696
Accrued liabilities	22,447	22,937
Deferred revenues	15,691	6,411
Warranty obligations, current portion (includes $2,240 and $3,296 measured at fair value at December 31, 2017 and 2016, respectively)	7,427	8,596
Revolving credit facility	0	10,100
Debt, current	17,429	3,032
Total current liabilities	91,741	82,772
Deferred revenues, non-current	29,941	33,893
Warranty obligations, non-current (includes $7,551 and $7,036 measured at fair value at December 31, 2017 and 2016, respectively)	22,389	22,818
Other non-current liabilities	1,880	2,025
Debt, less current portion	32,322	20,768
Total liabilities	178,273	162,276
Commitments and contingencies
Stockholders’ (deficit) equity:
Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value, 125,000 and 100,000 shares authorized and 85,914 and 62,269 shares issued and outstanding at December 31, 2017 and 2016, respectively	1	1
Additional paid-in capital	287,256	252,126
Accumulated deficit	(295,727)	(250,535)
Accumulated other comprehensive loss	(656)	(292)
Total stockholders’ (deficit) equity	(9,126)	1,300
Total liabilities and stockholders’ (deficit) equity	$ 169,147	$ 163,576