CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 18,944	$ 39,457
Restricted cash	4,320	4,950
Accounts receivable, net of allowance for doubtful accounts of $0 and $37,912 as of September 30, 2018 and December 31, 2017, respectively	113,628	85,522
Inventory	23,105	38,044
Prepaid expenses and other current assets	11,944	18,620
Total current assets	171,941	186,593
Property and equipment, net of accumulated depreciation of $97,788 and $88,298 as of September 30, 2018 and December 31, 2017, respectively	25,177	26,973
Goodwill	367,198	367,198
Intangible assets, net of accumulated amortization of $47,120 and $40,436 as of September 30, 2018 and December 31, 2017, respectively	12,030	19,114
Deferred taxes	990	1,098
Other non-current assets	1,836	2,116
Total assets	579,172	603,092
Current liabilities
Current portion of long-term debt	2,076	1,722
Accounts payable	63,901	65,963
Amounts due to plan sponsors	1,546	4,621
Accrued interest	2,268	6,706
Accrued expenses and other current liabilities	26,204	26,118
Total current liabilities	95,995	105,130
Long-term debt, net of current portion	496,770	478,866
Other non-current liabilities	22,744	21,769
Total liabilities	615,509	605,765
Stockholders’ deficit
Preferred stock, $.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	0	0
Common stock, $.0001 par value; 250,000,000 shares authorized; 128,064,145 and 127,634,012 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	13	13
Treasury stock, 287,248 and 5,106 shares outstanding, at cost, as of September 30, 2018 and December 31, 2017, respectively	(849)	(16)
Additional paid-in capital	619,989	624,762
Accumulated deficit	(745,841)	(709,511)
Total stockholders’ deficit	(126,688)	(84,752)
Total liabilities and stockholders’ deficit	579,172	603,092
Series A convertible preferred stock, $.0001 par value; 825,000 shares authorized; 21,630 and 21,645 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively; and $3,172 and $2,916 liquidation preference as of September 30, 2018 and December 31, 2017, respectively
Current liabilities
Convertible preferred stock	3,126	2,827
Series C convertible preferred stock, $.0001 par value; 625,000 shares authorized; 614,177 shares issued and outstanding as of September 30, 2018 and December 31, 2017; and $92,038 and $84,555 liquidation preference as of September 30, 2018 and December 31, 2017, respectively
Current liabilities
Convertible preferred stock	$ 87,225	$ 79,252