Restructuring Costs (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2018 USD ($) installment $ / shares
Restructuring Costs
Reduction in workforce (as a percent)	30.00%
Restructuring Costs
Beginning balance		$ 0
Charges		1,019
Payments		(381)
Ending balance		638
Accrued severance
Restructuring Costs
Beginning balance		0
Charges		381
Payments		(381)
Ending balance
Accrued retention bonus
Restructuring Costs
Beginning balance		0
Charges		638
Ending balance		638
Retention Plan
Restructuring Costs
Cash portion of the retention plan		$ 600
Stock option exercise price (in dollars per share) \| $ / shares		$ 0.58
Number of installments for option to vest \| installment		4
Retention Plan \| Vesting on June 20, 2018
Restructuring Costs
Percentage of installments for option to vest		25.00%
Retention Plan \| Vesting on December 31, 2018
Restructuring Costs
Percentage of installments for option to vest		25.00%
Retention Plan \| Vesting on June 30, 2019
Restructuring Costs
Percentage of installments for option to vest		25.00%
Retention Plan \| Vesting on December 31, 2019
Restructuring Costs
Percentage of installments for option to vest		25.00%

The total amount of the cash portion of the Retention Plan.

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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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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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