Debt - Kanis S.A. Indebtedness (Details) - USD ($)		1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Aug. 30, 2016	Jan. 31, 2017	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Apr. 01, 2016
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ (194,000)	$ (12,410,000)
Kanis Agreement
Debt Instrument [Line Items]
Liquidity event discount rate							25.00%
Convertible Debt | Kanis Agreement
Debt Instrument [Line Items]
Aggregate principal amount outstanding			$ 7,500,000	$ 7,500,000
Liquidity event discount rate						25.00%
Conversion price (in dollars per share)			$ 1.6215	$ 1.6215		$ 3.60
Loss on extinguishment of debt	$ 10,200,000		$ 1,600,000	$ 1,600,000
Issuance of common stock on conversion of debt (in shares)	4,872,032
Extinguishment of debt, amount	$ 7,900,000
Accrued interest and embedded derivative liability	$ 400,000
Convertible Debt | 2.0 million 8% shareholder note due 2017
Debt Instrument [Line Items]
Face amount of debt					$ 2,000,000		$ 2,000,000.0
Interest rate (as a percent)					8.00%		8.00%
Repayment of shareholder note		$ 2,000,000