Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,524	$ 185,606
Restricted cash	102	101
Accounts receivable, net	17,469	6,483
Inventory	14,554	3,717
Prepaid expenses and other current assets	3,786	5,487
Total current assets	57,435	201,394
Restricted cash	674	584
Property and equipment, net	15,765	21,915
Other assets	27	27
Intangible assets, net	3,977	7,355
Goodwill	3,605	3,605
Total assets	81,483	234,880
Current liabilities:
Accounts payable, accrued expenses and other	49,982	52,082
Deferred revenues	36,226	50,137
Deferred rent	2,014	1,527
Total current liabilities	88,222	103,746
Deferred revenues, net of current portion	25,673	51,197
Deferred rent, net of current portion	3,386	4,926
Deferred tax incentives, net of current portion		1,045
Long-term debt, net of current portion	216,861	257,655
Total liabilities	334,142	418,569
Commitments and contingencies
Non-controlling interest	(1,539)	239
Stockholders’ deficit:
Preferred stock, $0.01 par value: 10,000 shares authorized at December 31, 2016 and 2015; no shares issued or outstanding at December 31, 2016 or 2015
Common stock, $0.01 par value: 200,000 shares authorized at December 31, 2016 and 2015, 130,197 and 115,871 issued and outstanding at December 31, 2016 and 2015, respectively	1,302	1,159
Additional paid-in capital	702,377	617,145
Accumulated deficit	(954,799)	(802,232)
Total stockholders’ deficit	(251,120)	(183,928)
Total liabilities, non-controlling interest and stockholders’ deficit	$ 81,483	$ 234,880