12.5 % Senior Secured Notes and Loans Payable, 12.5% Senior Secured Notes (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 15, 2019 USD ($) Tranche	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
12.5% Senior Secured Notes [Abstract]
Warrants issued (in shares) | shares		2,000,000		2,000,000
Warrant exercise price (in dollars per share) | $ / shares		$ 0.001		$ 0.001
Net proceeds from issuance of initial notes, warrants and first offer rights	$ 66,082
Remaining proceeds after repayment of debt	13,990
Debt Maturity [Abstract]
Remainder of 2019		$ 0		$ 0
2020		0		0
2021		3,500		3,500
2022		10,500		10,500
2023		17,500		17,500
2024 and thereafter		38,500		38,500
Total		70,000		70,000
Amortization expense, deferred debt issuance costs and debt discounts				1,338	$ 1,297
Unamortized deferred debt issuance cost and deferred debt discounts		$ 0		$ 0		$ 2,797
Perceptive Credit Opportunities Fund, LP [Member]
12.5% Senior Secured Notes [Abstract]
Warrants issued (in shares) | shares		863,400		863,400
Debt Maturity [Abstract]
Amortization expense, deferred debt issuance costs and debt discounts		$ 64	$ 374	$ 847	$ 1,297
Unamortized deferred debt issuance cost and deferred debt discounts		$ 1,952		$ 1,952
Perceptive Credit Opportunities Fund, LP [Member] | Line of Credit [Member]
12.5% Senior Secured Notes [Abstract]
Interest rate		2.00%		2.00%
Payment of existing debt obligation	$ (52,092)
Debt maturity date				Dec. 16, 2020
Senior Secured Notes Due 2025 [Member]
12.5% Senior Secured Notes [Abstract]
Principal amount		$ 70,000		$ 70,000
Interest rate	12.50%	12.50%		12.50%
Warrants issued (in shares) | shares		2,000,000		2,000,000
Warrant exercise price (in dollars per share) | $ / shares		$ 4.25		$ 4.25
Number of tranches | Tranche	2
Frequency of periodic principal payment				quarterly
Debt maturity date				Jun. 30, 2025
Annual percentage increase in principal payments during first four quarters		10.00%
Annual percentage increase of initial loan principal payments during final four quarters		40.00%
Debt Maturity [Abstract]
Redemption percentage of debt under change of control provisions		101.00%
Amortization expense, deferred debt issuance costs and debt discounts		$ 493		$ 493
Unamortized deferred debt issuance cost and deferred debt discounts		$ 10,225		10,225
Senior Secured Notes Due 2025 [Member] | Minimum [Member]
Debt Maturity [Abstract]
Elective redemption percentage of debt		101.56%
Senior Secured Notes Due 2025 [Member] | Maximum [Member]
12.5% Senior Secured Notes [Abstract]
Principal amount		$ 100,000		100,000
Additional borrowing capacity		$ 30,000		30,000
Debt Maturity [Abstract]
Elective redemption percentage of debt		112.50%
Asset based loans secured on second priority lien by receivables and inventory assets		$ 10,000		10,000
Senior Secured Notes Due 2025 - First Additional Offering [Member]
12.5% Senior Secured Notes [Abstract]
Additional borrowing capacity		10,000		10,000
Senior Secured Notes Due 2025 - First Additional Offering [Member] | Maximum [Member]
Debt Maturity [Abstract]
Portion of proceeds used to monetize assets, if First Additional Offering has not been elected or funded		40,000
Senior Secured Notes Due 2025 - Second Additional Offering [Member]
12.5% Senior Secured Notes [Abstract]
Additional borrowing capacity		20,000		$ 20,000
Senior Secured Notes Due 2025 - Second Additional Offering [Member] | Maximum [Member]
Debt Maturity [Abstract]
Portion of proceeds used to monetize assets, if First Additional Offering has been elected and funded		$ 50,000