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Income Taxes - Summary of Net Operating Loss and Research Credit Carryforwards (Detail)
$ in Millions
 12 Months Ended
Jun. 30, 2018
USD ($)
Domestic Country [Member] | Federal [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 112.2
Net operating losses subject to sections 382,383 Yes
Domestic Country [Member] | Federal [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2027
Domestic Country [Member] | Federal [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2033
Domestic Country [Member] | Federal [Member] | Research [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit $ 4.7
Research credit subject to sections 382,383 Yes
Domestic Country [Member] | Federal [Member] | Research [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2025
Domestic Country [Member] | Federal [Member] | Research [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2032
State and Local Jurisdiction [Member] | UTAH [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 209.5
Net operating losses subject to sections 382,383 No
State and Local Jurisdiction [Member] | UTAH [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2016
State and Local Jurisdiction [Member] | UTAH [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2024
State and Local Jurisdiction [Member] | UTAH [Member] | Research [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit $ 10.6
Research credit subject to sections 382,383 No
State and Local Jurisdiction [Member] | UTAH [Member] | Research [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2021
State and Local Jurisdiction [Member] | UTAH [Member] | Research [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Research credit, expiration in year 2031
State and Local Jurisdiction [Member] | OKLAHOMA [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 14.1
Net operating losses subject to sections 382,383 Yes
State and Local Jurisdiction [Member] | OKLAHOMA [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2023
State and Local Jurisdiction [Member] | OKLAHOMA [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration in year 2033
Foreign (various jurisdictions) [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses $ 34.7
Net operating losses subject to sections 382,383 No
Foreign (various jurisdictions) [Member] | Minimum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration date ranges Various
Foreign (various jurisdictions) [Member] | Maximum [Member]  
Operating Loss Carryforwards [Line Items]  
Net operating losses, expiration date ranges Various