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Restructuring - Additional Information (Details)	3 Months Ended				12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017	Mar. 31, 2016 USD ($) Position	Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Total termination charges				$ 676,000
Severance benefits and other one-time termination costs				600,000
Cash expenditures				$ 600,000
Reduction in workforce, as a percent			60.00%
Restructuring expense		$ 50,000			$ 1,000,000
Termination fee	$ 270,000
United States
Restructuring Cost And Reserve [Line Items]
Number of positions/employees terminated | Position				12
Hyderabad India
Restructuring Cost And Reserve [Line Items]
Number of positions/employees terminated | Position				18

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The expected number of positions to be eliminated, expressed as a percentage, as a result of restructuring activities.

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Amount of capital expenditure attributable to discontinued operations.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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The number of positions eliminated during the period as a result of restructuring activities.

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