Preferred Shares - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 02, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		9,042	9,042	9,042
Weighted average share price	$ 3.30
Deemed dividend on beneficial conversion feature	$ 47,800		$ 0	$ 47,849
In-kind dividends			1,849	1,459	$ 0
Deemed dividend on beneficial conversion feature related to in-kind dividend			$ 0	$ 281
Right to convert to common shares (in years)			2 years
Mandatory conversion of common shares (in years)			5 years
Series A Preferred Stock
Class of Stock [Line Items]
Annual percentage dividend on liquidation preference	2.00%
Noralta | Preferred Shares
Class of Stock [Line Items]
Escrow deposits, preferred shares released (in shares)	692
Noralta | Preferred Shares | Series A Preferred Stock
Class of Stock [Line Items]
Preferred shares issued (in shares)	9,679
Initial liquidation preference per share (in USD per share)	$ 10,000
Escrow deposits, preferred shares released (in shares)		637
Preferred Stock Convertible into Common Stock
Class of Stock [Line Items]
Conversion price (in USD per share)			$ 3.30