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Restructuring Charge (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017
Reduction in workforce, as a percent	60.00%
Restructuring charges
Restructuring charge	$ 1,002	$ 1,002	$ 676
Cash payments		(418)
Balance at the end of the period	584	584
Minimum | Scenario, Forecast
Expected Cost Remaining				$ 100
Maximum | Scenario, Forecast
Expected Cost Remaining				$ 300
Workforce reduction
Restructuring charges
Restructuring charge		408
Cash payments		(408)
Contractual obligations and other termination costs
Restructuring charges
Restructuring charge		594
Cash payments		(10)
Balance at the end of the period	$ 584	$ 584

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Amount of expected cost remaining for the specified 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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-Name Accounting Standards Codification
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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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-Topic 420
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- Definition

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