Leases - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Term	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 05, 2019 ft²	Jan. 01, 2019 USD ($)	Apr. 01, 2018 ft²	Mar. 06, 2018 ft²
Lessee Lease Description [Line Items]
Operating lease right of use asset	$ 200,000		$ 200,000		$ 400,000		$ 400,000
Operating lease liability, current	226,421		226,421
Operating lease liability, non-current	$ 311,544		$ 311,544
Operating lease discount rate	8.00%		8.00%
Operating lease, weighted average remaining lease term	2 years 8 months 12 days		2 years 8 months 12 days
Operating lease, cash payment made	$ 50,000		$ 78,000
Operating lease expense	46,000	$ 23,000	86,000	$ 60,000
ASU 2016-02
Lessee Lease Description [Line Items]
Operating lease liability, current	100,000		100,000		200,000
Operating lease liability, non-current	$ 100,000		$ 100,000		$ 200,000
Newton Lease | Newton, Massachusetts
Lessee Lease Description [Line Items]
Lease agreement date			Mar. 06, 2018
Lease commencement date			Oct. 01, 2018
Square feet of office space leased | ft²									2,760
Amended Newton Lease | Newton, Massachusetts
Lessee Lease Description [Line Items]
Lease agreement date			Mar. 05, 2019
Lease commencement date			Jun. 01, 2019
Square feet of office space leased | ft²						1,600
Lease expiration date			May 31, 2022
Bend Lease | Oregon
Lessee Lease Description [Line Items]
Lease agreement date			Apr. 01, 2018
Lease commencement date			Apr. 01, 2018
Square feet of office space leased | ft²								2,288
Lease expiration date			Mar. 31, 2021
Maximum additional periods of option to extend the bend term | Term			2
Option to extend bend term for duration period			3 years