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Subsequent Events (Details)		3 Months Ended	9 Months Ended
	Nov. 03, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Oct. 16, 2017 USD ($) installment	Mar. 31, 2016 USD ($)
Subsequent Event [Line Items]
Repayment of long-term debt			$ 0	$ 5,000,000
Thyroid Cytopathology Partners | Subsequent Event
Subsequent Event [Line Items]
Contract termination fee					$ 1,750,000
Payment installments for contract termination Fee | installment					8
Visium | Line of Credit
Subsequent Event [Line Items]
Maximum borrowing capacity						$ 40,000,000.0
Interest rate (as a percent)			12.00%
Visium | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Repayment of long-term debt	$ 27,300,000
Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity	35,000,000.0
Secured Debt | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity	25,000,000.0
Balloon payment to be paid	1,200,000.0
Revolving Credit Facility | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity	$ 10,000,000.0
London Interbank Offered Rate (LIBOR) | Secured Debt | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate	4.20%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate	3.50%
Minimum [Member] | London Interbank Offered Rate (LIBOR) | Secured Debt | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Interest rate (as a percent)	5.43%
Minimum [Member] | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Silicon Valley Bank | Line of Credit | Subsequent Event
Subsequent Event [Line Items]
Interest rate (as a percent)	4.70%
Scenario, Forecast | Visium
Subsequent Event [Line Items]
Payments of debt extinguishment costs		$ 1,900,000

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