CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 20,820	$ 39,457
Restricted cash	4,950	4,950
Receivables, less allowance for doubtful accounts of $0 and $37,912 as of June 30, 2018 and December 31, 2017, respectively	96,917	85,522
Inventory	25,286	38,044
Prepaid expenses and other current assets	8,583	18,620
Total current assets	156,556	186,593
Property and equipment, net of accumulated depreciation of $92,588 and $86,675 as of June 30, 2018 and December 31, 2017, respectively	25,004	26,973
Goodwill	367,198	367,198
Intangible assets, net of accumulated amortization of $44,904 and $40,036 as of June 30, 2018 and December 31, 2017, respectively	14,247	19,114
Deferred income taxes	1,041	1,098
Other non-current assets	2,100	2,116
Total assets	566,146	603,092
Current liabilities
Current portion of long-term debt	957	1,722
Accounts payable	49,264	65,963
Amounts due to plan sponsors	2,184	4,621
Accrued interest	6,728	6,706
Accrued expenses and other current liabilities	23,028	26,118
Total current liabilities	82,161	105,130
Long-term debt, net of current portion	492,309	478,866
Other non-current liabilities	21,151	21,769
Total liabilities	595,621	605,765
Stockholders’ deficit
Preferred stock, $.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	0	0
Common stock, $.0001 par value; 250,000,000 shares authorized; 128,046,122 and 127,634,012 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	13	13
Treasury stock, 110,496 and 5,106 shares outstanding, at cost, as of June 30, 2018 and December 31, 2017, respectively	(327)	(16)
Additional paid-in capital	621,015	624,762
Accumulated deficit	(737,667)	(709,511)
Total stockholders’ deficit	(116,966)	(84,752)
Total liabilities and stockholders’ deficit	566,146	603,092
Series A convertible preferred stock, $.0001 par value; 825,000 shares authorized; 21,643 shares issued and outstanding as of June 30, 2018 and December 31, 2017; and $3,084 and $2,916 liquidation preference as of June 30, 2018 and December 31, 2017, respectively
Current liabilities
Convertible preferred stock	3,022	2,827
Series C convertible preferred stock, $.0001 par value; 625,000 shares authorized; 614,177 shares issued and outstanding as of June 30, 2018 and December 31, 2017; and $89,445 and $84,555 liquidation preference as of June 30, 2018 and December 31, 2017, respectively
Current liabilities
Convertible preferred stock	$ 84,469	$ 79,252