Commitments and Contingencies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Rent expense	$ 1,400,000	$ 1,400,000
Liability in connection with lawsuit	0
Alphatec Spine, Inc.
Loss Contingencies [Line Items]
Guaranteed obligated minimum royalty payments through 2022 and beyond	$ 5,900,000
Building lease
Loss Contingencies [Line Items]
Area for facility of office, engineering and research and development space | ft²	76,000
Lease agreement expiry date	Jul. 31, 2021
First year | Building lease
Loss Contingencies [Line Items]
Lease rent payable per month	$ 111,000
Each year thereafter | Building lease
Loss Contingencies [Line Items]
Lease rent payable increase per month	$ 3,000