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Income Taxes - Summary of Net Operating Loss and Research Credit Carryforwards (Detail) - Jun. 30, 2015 - USD ($)
$ in Millions
Total
Domestic Country | Federal  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 138.4
Net operating losses subject to sections 382,383 Yes
Domestic Country | Federal | Research  
Operating Loss Carryforwards [Line Items]  
Research credit $ 3.2
Research credit subject to sections 382,383 Yes
State and Local Jurisdiction | UTAH  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 229.9
Net operating losses subject to sections 382,383 No
State and Local Jurisdiction | UTAH | Research  
Operating Loss Carryforwards [Line Items]  
Research credit $ 8.6
Research credit subject to sections 382,383 No
State and Local Jurisdiction | OKLAHOMA  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 14.1
Net operating losses subject to sections 382,383 Yes
Foreign (various jurisdictions)  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 39.3
Net operating losses subject to sections 382,383 No
Minimum | Domestic Country | Federal  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2027
Minimum | Domestic Country | Federal | Research  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2025
Minimum | State and Local Jurisdiction | UTAH  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2016
Minimum | State and Local Jurisdiction | UTAH | Research  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2021
Minimum | State and Local Jurisdiction | OKLAHOMA  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2023
Minimum | Foreign (various jurisdictions)  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration date ranges Various
Maximum | Domestic Country | Federal  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2033
Maximum | Domestic Country | Federal | Research  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2032
Maximum | State and Local Jurisdiction | UTAH  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2024
Maximum | State and Local Jurisdiction | UTAH | Research  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2029
Maximum | State and Local Jurisdiction | OKLAHOMA  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2033
Maximum | Foreign (various jurisdictions)  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration date ranges Various