Commitments and Contingencies - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies [Line Items]
Royalty payments, percent of net sales	1.00%
Monthly rental payments	$ 14,000
Future minimum operating leases payment in 2019	168,000
Future minimum operating leases payment in 2020	140,000
Rent expense incurred under operating lease	168,000	$ 168,000
Contract Termination
Commitments And Contingencies [Line Items]
Termination payment	$ 25,500,000

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Commitments and contingencies.

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Operating lease monthly rental payments.

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Royalty payments, percent of net sales.

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