Credit Facilities (Various credit facilities) (Details)	Jul. 29, 2016 USD ($)	Jul. 21, 2015 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jul. 11, 2016 USD ($)	Mar. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Restricted cash					$ 2,000,000
Revolving Credit Facility | Bank of America
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 20,000,000.0
Debt instrument, term		2 years
Debt instrument, termination notice period		3 days
Debt covenant, minimum current ratio		1.5
Revolving Credit Facility | Japan Lifeline Co., Ltd.
Line of Credit Facility [Line Items]
Amount borrowed						$ 6,000,000
Convertible notes, stated percentage						1.50%
Revolving Credit Facility | MidCap Financial Trust
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50,000,000.0
Amount borrowed				$ 0
Interest rate at end of period			4.80%
Maximum amount on which fees are calculated	$ 10,000,000
Unused line fee	0.50%
Collateral management fee	0.50%
Deferred financing costs	$ 900,000						$ 900,000
Debt issuance costs			$ 800,000
Revolving Credit Facility | MidCap Financial Trust | London Interbank Offered Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	4.10%
Variable rate, maximum	0.50%
Revolving Credit Facility | Minimum | Bank of America
Line of Credit Facility [Line Items]
Liquidation proceeds, credit derivative (not less than)		$ 30,000,000.0
Letter of Credit | Bank of America
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 10,000,000.0