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Debt - Narrative (Details) - Line of credit			9 Months Ended
	Nov. 03, 2017 USD ($)	Mar. 30, 2016 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2016 USD ($) term_loan
Silicon Valley Bank
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 35,000,000
Liquidity requirement, minimum			$ 40,000,000
Visium
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 40,000,000.0
Number of term loans | term_loan				2
Repayments of long-term debt	27,300,000
Payment of end of term obligation	1,500,000
Secured debt | Silicon Valley Bank
Debt Instrument [Line Items]
Maximum borrowing capacity	25,000,000
Effective interest rate (as a percent)			8.05%
Balloon payment to be paid	1,200,000.0
Secured debt | Silicon Valley Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			4.20%
Secured debt | Silicon Valley Bank | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Interest rate (as a percent)			5.34%
Revolving credit facility | Silicon Valley Bank
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000
Revolving credit facility | Silicon Valley Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			3.50%
Revolving credit facility | Silicon Valley Bank | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Interest rate (as a percent)			4.70%
Debt prepayment tranche one | Revolving credit facility | Silicon Valley Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Prepayment premium			$ 750,000
Debt prepayment tranche two | Revolving credit facility | Silicon Valley Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Prepayment premium			500,000
Debt prepayment tranche three | Revolving credit facility | Silicon Valley Bank | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Prepayment premium			$ 250,000
Initial term loan | Visium
Debt Instrument [Line Items]
Proceeds from lines of credit		$ 25,000,000

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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