Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt [Abstract]

Debt Payable

	December 31,
	2017		2016
Secured term debt due June 17, 2018		34,620		34,620
Total debt before fees and debt discount/premium		34,620		34,620
Less:  Deferred financing costs		(228)		(737)
Debt discount		(1,030)		(3,306)
Add:  Debt premium		345		—
Total debt payable	$	33,707	$	30,577
Debt payable, current portion	$	33,707	$	1,900
Debt payable, long-term	$	—	$	28,677

Minimum Payments Required on Outstanding Balances

	2015 Credit Agreement
2018	$	34,620
	$	34,620

Interest Expense and Other Related Financing Costs

	Years Ended
	December 31,
	2017		2016		2015
Interest expense and other financing costs	$	3,720	$	3,782	$	7,817
Interest expense - beneficial conversion feature		—		45,915		—
Interest paid-in kind		—		14,695		11,434
Write-off of deferred financing costs and debt discount		—		3,820		2,752
Amortization of deferred financing costs, debt discount and debt premium		2,242		4,422		5,157
Interest expense	$	5,962	$	72,634	$	27,160