Amount of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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Face (par) amount of debt instrument at time of issuance.

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Increase for accrued, but unpaid interest on the debt instrument for the period.

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Debt - Bridge Notes (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Sep. 22, 2016	Jul. 14, 2016	Jul. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Stock issued in a private transaction, net of offering cost				$ 49,044	$ 76,056	$ 103,949
Conversion of stock, shares converted (in shares)			0.21
Bridge Loan
Debt Instrument [Line Items]
Aggregate principal amount	$ 3,100	$ 52,600
Proceeds from issuance of debt		50,000
Accrued interest	300
Debt issuance cost				$ 3,000
EGI \| Affiliated Entity \| Bridge Loan
Debt Instrument [Line Items]
Aggregate principal amount		36,800
Debt instrument, fee amount		$ 1,800
Rights Offering \| Common Stock
Debt Instrument [Line Items]
Stock issued in a private transaction, net of offering cost	$ 49,900
Rights Offering \| Common Stock \| Bridge Loan
Debt Instrument [Line Items]
Shares subscribed but unissued (in shares)	4,000,000
Conversion of stock, shares converted (in shares)	272,733
Conversion price	$ 12.25