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Supplemental Balance Sheet Information (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Supplemental Balance Sheet Information [Abstract]    
Property, Plant and Equipment
Property and equipment, net
 
September 30,
2017
 
December 31,
2016
Scientific equipment
$
1,586

 
$
993

Leasehold improvements
192

 
57

Furniture and fixtures
31

 
27

Computers and software
26

 
26

Construction in process
—

 
17

Property and equipment, gross
1,835

 
1,120

Less: accumulated depreciation
(776
)
 
(617
)
Property and equipment, net
$
1,059

 
$
503
Components of property and equipment were as follows:
 
December 31,
 
2016
 
2015
Scientific equipment
$
993

 
$
627

Leasehold improvements
57

 
57

Furniture and fixtures
27

 
17

Computers and software
26

 
14

Construction in process
17

 
107

Property and equipment, gross
1,120

 
822

Less: accumulated depreciation
(617
)
 
(437
)
Property and equipment, net
$
503

 
$
385
Schedule of Accrued Liabilities
Accrued expenses and other current liabilities
 
September 30,
2017
 
December 31,
2016
Accrued Northwestern University License Agreements fee (Note 11)
$
—

 
$
1,500

Accrued legal expenses
1,004

 
123

Accrued payroll-related expenses
513

 
423

Other accrued expenses
979

 
114

     Accrued expenses and other current liabilities
$
2,496

 
$
2,160