CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 14,390	$ 14,539
Restricted cash	4,322	4,321
Accounts receivable, net	118,081	114,864
Inventory	27,801	26,689
Prepaid expenses and other current assets	13,046	14,292
Total current assets	177,640	174,705
Property and equipment, net of accumulated depreciation of $76,282 and $100,851 as of June 30, 2019 and December 31, 2018, respectively	27,103	28,788
Goodwill	367,198	367,198
Deferred taxes	995	1,032
Intangible assets, net of accumulated amortization of $51,800 and $49,080 as of June 30, 2019 and December 31, 2018, respectively	7,351	10,470
Operating lease right-of-use assets	18,611	0
Other non-current assets	1,679	1,745
Total assets	600,577	583,938
Current liabilities
Current portion of long-term debt	5,879	3,179
Current portion of operating lease liabilities	5,335	0
Accounts payable	73,367	67,025
Amounts due to plan sponsors	573	956
Accrued interest	6,659	6,706
Accrued expenses and other current liabilities	24,352	29,450
Total current liabilities	116,165	107,316
Long-term debt, net of current portion	519,384	501,495
Operating lease liabilities, net of current portion	19,231	0
Other non-current liabilities	21,009	25,842
Total liabilities	675,789	634,653
Stockholders’ deficit
Preferred stock, $.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	0	0
Common stock, $.0001 par value; 250,000,000 shares authorized; 129,620,672 shares issued and 128,956,878 shares outstanding at June 30, 2019, and 128,391,456 shares issued and 128,077,651 shares outstanding as of December 31, 2018, respectively	13	13
Treasury stock, 663,794 and 313,805 shares outstanding, at cost, as of June 30, 2019 and December 31, 2018, respectively	(1,722)	(950)
Additional paid-in capital	614,335	618,137
Accumulated deficit	(787,152)	(761,204)
Total stockholders’ deficit	(174,526)	(144,004)
Total liabilities and stockholders’ deficit	600,577	583,938
Series A convertible preferred stock, $.0001 par value; 825,000 shares authorized; 21,630 shares issued and outstanding; and $3,452 and $3,264 liquidation preference as of June 30, 2019 and December 31, 2018, respectively
Current liabilities
Convertible preferred stock	3,442	3,231
Series C convertible preferred stock, $.0001 par value; 625,000 shares authorized; 614,177 shares issued and outstanding; and $100,184 and $94,706 liquidation preference as of June 30, 2019 and December 31, 2018, respectively
Current liabilities
Convertible preferred stock	$ 95,872	$ 90,058