Subsequent Events (Details) - USD ($)	Feb. 24, 2020	Jan. 27, 2020	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Common stock outstanding (in shares)			25,163,803	24,450,757
Subsequent Event
Subsequent Event [Line Items]
Common stock outstanding (in shares)		27,708,111
Subsequent Event | SeaSpine | Joint development agreement
Subsequent Event [Line Items]
Approximate monthly payments due per agreement	$ 10,000
Term of agreement (in years)	10 years
Subsequent Event | Follow-on public offering
Subsequent Event [Line Items]
Number of shares sold (in shares)		2,490,053
Public offering price (in dollars per share)		$ 21.5
Net proceeds from sale of stock		$ 50,300,000
Subsequent Event | Underwriters option
Subsequent Event [Line Items]
Number of shares sold (in shares)	645,000
Public offering price (in dollars per share)	$ 21.50
Net proceeds from sale of stock	$ 13,000,000
Subsequent Event | Secondary offering by selling shareholders
Subsequent Event [Line Items]
Number of shares sold (in shares)		1,809,947
Public offering price (in dollars per share)		$ 21.5