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Restructuring Charge (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017
Reduction in workforce, as a percent	60.00%
Restructuring expense	$ 100
Restructuring charges
Restructuring charge	50	$ 1,052	$ 676
Cash payments		(577)
Balance at the end of the period	475	475
Scenario, Forecast | Minimum
Expected Cost Remaining				$ 200
Scenario, Forecast | Maximum
Expected Cost Remaining				$ 300
Workforce reduction
Restructuring charges
Restructuring charge		458
Cash payments		(458)
Contractual obligations and other termination costs
Restructuring charges
Restructuring charge		594
Cash payments		(119)
Balance at the end of the period	$ 475	$ 475

X

- Definition

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

+ References

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of expected cost remaining for the specified restructuring cost.

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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.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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