Debt (Details)		1 Months Ended			3 Months Ended		9 Months Ended
	Mar. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) loan	Dec. 31, 2014	Jun. 30, 2013 USD ($)	Sep. 30, 2017 USD ($) installment	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) installment	Sep. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)
Debt
Repayment of long-term debt							$ 0	$ 5,000,000
Paid-in-kind interest							0	385,000
Interest Expense, Debt [Abstract]
Nominal interest					$ 778,000	$ 772,000	2,311,000	1,600,000
Amortization and write-off of debt discount and debt issuance costs					27,000	27,000	79,000	145,000
Prepayment penalty					0	0	0	50,000
End-of-term payment interest					0	0	0	156,000
Interest on capital lease					10,000	0	33,000	0
Total					$ 815,000	$ 799,000	$ 2,423,000	$ 1,951,000
Line of Credit | Visium
Debt
Number of term loans | loan		2
Maximum borrowing capacity		$ 40,000,000.0
Interest rate (as a percent)					12.00%		12.00%
Number of installments | installment					8		8
Term of debt with equal quarterly installments							2 years
Rate for which Company may elect to pay interest in cash (as a percent)					0.090		0.090
Remaining percentage for which interest is paid-in-kind					0.030		0.030
Paid-in-kind interest					$ 385,000
Prepayment allowed		5,000,000.0
Whole multiple in excess of minimum prepayment		$ 1,000,000.0
Prepayment premium for prepayment made on or prior to March 31, 2018 (as a percent)		0.24
Prepayment premium for prepayment made after March 31, 2018 and on or prior to March 31, 2019 (as a percent)		0.04
Prepayment premium for prepayment made after March 31, 2019 and on or prior to March 31, 2020 (as a percent)		0.02
Prepayment premium for prepayment made after March 31, 2020 and on or prior to March 31, 2021 (as a percent)		0.01
Debt principal					25,385,000		$ 25,385,000
Unamortized deferred debt issuance costs					(388,000)		(388,000)
Net debt obligation					24,997,000		24,997,000
Future principal payments
2020					9,519,000		9,519,000
2021					12,693,000		12,693,000
2022					3,173,000		3,173,000
Total					$ 25,385,000		$ 25,385,000
Line of Credit | Visium | Initial Term Loan
Debt
Drawn down initial term loan	$ 25,000,000
Repayment of long-term debt	$ 5,000,000
Line of Credit | Visium | Second Term Loan
Debt
Maximum borrowing capacity									$ 15,000,000.0
Term Loans
Debt
Maximum borrowing capacity				$ 10,000,000.0
Prepayment premium for prepayment made after March 31, 2021 (as a percent)			0
Future principal payments
Amount drawn down				$ 5,000,000