Common Shares (Details)	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 29, 2016 USD ($) $ / shares shares	Jul. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) Vote shares	Sep. 30, 2016 USD ($)	May 31, 2017 $ / shares shares	May 11, 2017 shares	Apr. 21, 2017 shares	Dec. 31, 2016 $ / shares shares
Number of shares authorized | shares			200,000,000		200,000,000	200,000,000	50,000,000	38,000,000
Common stock, par value (in dollars per share) | $ / shares					$ 0			$ 0
Number of votes | Vote			1
Dividends declared			$ 0
Issuance of common shares | shares	429,000	1,090,500
Issuance price per share | $ / shares	$ 7.00	$ 7.70
Proceeds from issuance of common shares	$ 2,980,000	$ 8,299,000		$ 11,399,000
Issuance costs	$ 23,000	$ 97,000	5,039,000	$ 238,000
Put option
Fair value of put option			$ 0