Debt - Additional Information (Detail)										1 Months Ended			12 Months Ended
	Feb. 05, 2016 USD ($)	Jan. 01, 2016 USD ($)	Jul. 10, 2015 USD ($)	Nov. 21, 2014 USD ($) shares	Mar. 20, 2014 USD ($) shares	Mar. 20, 2014 USD ($) shares	Mar. 17, 2014 USD ($) shares	Aug. 30, 2013 USD ($)	Aug. 30, 2013 USD ($)	Oct. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Oct. 31, 2013 USD ($)	Dec. 31, 2015 USD ($) payment shares	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 01, 2016	Mar. 11, 2016 USD ($)	Feb. 04, 2016	Jul. 31, 2015 USD ($)	Jul. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)
Line of Credit Facility [Line Items]
Line of credit, repayment													$ 144,567,000	$ 156,106,000	$ 168,855,000
Borrowings under lines of credit													141,583,000	163,067,000	154,622,000
Non-cash interest expense													300,000	300,000	200,000
Transaction fees													5,279,000	7,331,000
Litigation settlement expense													0	0	45,982,000
Restricted cash													$ 2,350,000	4,400,000
Capital leases maturity													September 2018
Minimum [Member]
Line of Credit Facility [Line Items]
Capital leases interest percentage													6.60%
Maximum [Member]
Line of Credit Facility [Line Items]
Capital leases interest percentage													9.60%
Working Capital Line of Credit [Member]
Line of Credit Facility [Line Items]
Interest expense													$ 5,300,000	5,300,000	$ 3,600,000
Amended Credit Facility with MidCap [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity								$ 73,000,000	$ 73,000,000				56,799,000	60,390,000						$ 50,000,000
Proceeds line of credit									28,000,000
Debt issuance costs									400,000
Less: debt discount													200,000
Debt default, interest rate increase							5.00%
Amendment fee amount																					$ 100,000
Amended Credit Facility with MidCap [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount drawn on line of credit								40,000,000	40,000,000
Line of credit, balance													$ 28,800,000
Line of credit, interest rate description													LIBOR plus 6.0%
Basis spread on variable line of credit rate													6.00%
Interest rate of revolving line of credit													6.20%
Amended Credit Facility with MidCap [Member] | Working Capital Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit, balance													$ 28,800,000
Amended Credit Facility with MidCap [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity								38,000,000	$ 38,000,000										$ 5,000,000
Proceeds line of credit								$ 28,000,000			$ 5,000,000
Line of credit, balance													$ 28,000,000
Line of credit, interest rate description													("LIBOR") plus 8.0%
Line of credit, interest rate floor													9.50%
Basis spread on variable line of credit rate													8.00%
Interest rate of revolving line of credit													9.50%
Term loan payments										$ 500,000		$ 300,000
Deerfield [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity							$ 50,000,000						$ 26,000,000	$ 26,000,000
Line of credit, balance				$ 6,000,000	$ 20,000,000	$ 20,000,000							$ 26,000,000
Aggregate amount of draw down for working capital							15,000,000
Line of credit, transaction fees, amount							$ 2,500,000.0
Transaction fee as percentage of principal amount							2.50%
Facility agreement stated interest rate							8.75%
Number of common shares to be called by warrants | shares													11,450,000
Net proceeds from initial draw under Facility Agreement					19,500,000	19,500,000
Transaction fees				$ 200,000	500,000	500,000
Number of warrants issued | shares				1,200,000
Warrants value				$ 900,000	4,700,000	4,700,000	$ 5,700,000
Additional borrowing under term loan			$ 5,000,000
Warrant amount reclassified as debt discount				200,000	$ 2,300,000	$ 2,300,000
Net proceeds from draw under Facility Agreement				$ 5,900,000
Equal annual payments | payment													3
Deerfield [Member] | Warrants Issued on March 17, 2014 [Member]
Line of Credit Facility [Line Items]
Number of common shares to be called by warrants | shares							6,250,000
Deerfield [Member] | Warrants issued on March 20, 2014 [Member]
Line of Credit Facility [Line Items]
Number of common shares to be called by warrants | shares					4,000,000	4,000,000
Number of warrants issued | shares					4,000,000
Deerfield [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Number of shares to purchase under warrants | shares							10,000,000
Orthotec LLC, Litigation Settlement [Member]
Line of Credit Facility [Line Items]
Litigation settlement expense													$ 23,000,000
Payments for settlements		$ 1,100,000
Subsequent Event [Member] | Third Amendment to Amended Credit Facility with MidCap [Member] [Member]
Line of Credit Facility [Line Items]
Amendment fee amount																	$ 500,000
Subsequent Event [Member] | Deerfield [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Amendment fee amount	$ 600,000
Amendment fee, quarterly amount	$ 200,000
Subsequent Event [Member] | Deerfield [Member] | Amended Credit Facility with Deerfield [Member]
Line of Credit Facility [Line Items]
Facility agreement stated interest rate	14.75%																	8.75%
Portion of interest paid-in-kind, percentage	6.00%
Scenario, Forecast [Member] | Deerfield [Member] | Amended Credit Facility with Deerfield [Member]
Line of Credit Facility [Line Items]
Portion of interest paid-in-kind, percentage																3.00%