CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 130,510	$ 280,587
Restricted cash	113,680
Accounts receivable, net of provision for doubtful accounts of $1,665 and $410 as of June 30, 2019 and December 31, 2018, respectively	51,671	81,782
Inventory	74,066	50,997
Prepaid expenses and other current assets	4,915	3,755
Prepaid income taxes	419	390
Total current assets	375,261	417,511
Property and equipment, net	30,062	29,879
Accounts receivable, net of current portion	1,181	2,388
Deferred tax assets	26,367	21,578
Other assets	2,780	3,293
Total assets	435,651	474,649
Current liabilities:
Accounts payable	9,203	17,776
Accrued expenses and other current liabilities	23,099	36,992
Accrued income taxes	92	958
Deferred revenue	25,444	31,206
Current portion of long-term debt, net of unamortized debt issuance costs	2,189	2,179
Total current liabilities	60,027	89,111
Accrued income taxes, net of current portion	5,031	4,923
Deferred revenue, net of current portion	8,801	12,479
Long-term debt, net of current portion and unamortized debt issuance costs	292,179	293,280
Total liabilities	366,038	399,793
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized as of June 30, 2019 and December 31, 2018; no shares issued and outstanding as of June 30, 2019 and December 31, 2018
Common stock, $0.001 par value; 500,000 shares authorized as of June 30, 2019 and December 31, 2018; 84,028 and 82,961 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	84	83
Additional paid-in capital	163,526	156,939
Accumulated other comprehensive loss	(1,091)	(1,158)
Accumulated deficit	(92,906)	(81,008)
Total stockholders’ equity	69,613	74,856
Total liabilities and stockholders’ equity	$ 435,651	$ 474,649