The Company and its Significant Accounting Policies (Policies)	9 Months Ended
Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant inter-company transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures have been condensed or omitted pursuant to such rules and regulations. The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of the periods presented. The results for the three and nine months ended March 31, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending June 30, 2019, or for any other future interim period or fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes for the fiscal year ended June 30, 2018 included in the Company’s Annual Report on Form 10-K filed with the SEC on August 24, 2018.
Significant Accounting Policies	Significant Accounting Policies The Company adopted Accounting Standard Codification (“ASC”) 606, Revenue from Contracts with Customers as of July 1, 2018, using the modified retrospective method. See Note 2. Recent Accounting Pronouncements and Note 3. Revenue, to our unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q for additional details. Except for the changes in the revenue recognition policy, there have been no other material changes to the Company’s accounting policies from the information provided in Note 1. The Company and its Significant Accounting Policies to the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2018.
Revenue Recognition	Revenue Recognition The Company’s revenue is primarily derived from sales of CyberKnife and TomoTherapy Systems and services, which include post-contract customer support (“PCS”), installation services, training and other professional services. The Company has a contract with a customer when there is approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The Company's revenues are measured based on consideration specified in the contract with each customer, net of any sales incentives and amounts collected on behalf of third parties such as sales taxes, excise taxes, and VAT. The majority of the Company's revenue arrangements consists of multiple performance obligations, which can include system, upgrades, installation, training, services, construction, and consumables. For bundled arrangements, the Company accounts for individual products and services separately if a product or service is separately identifiable from other items in the bundled package and if a customer can benefit from it on its own or with other resources that are readily available to the customer. The Company’s products are generally not sold with a right of return, and the Company’s contracts generally provide a fixed transaction price. However, the Company from time to time offers variable consideration such as volume discounts. The Company also from time to time offers extended payment terms beyond one year, trade-in allowance for old systems, and commissions or other forms of payment to customers. The Company applied the practical expedient to not adjust for a significant financing component if the gap between payment and delivery was expected, at the contract inception, to be less than one year. The stand-alone selling price (“SSP”) of performance obligations is determined based on observable prices at which the Company separately sells the products and services. If the SSP is not directly observable, then the Company will estimate the SSP considering market conditions, entity-specific factors, and information about the customer or class of customer that is reasonably available. The SSP is generally assessed as a percentage of the list price. The contract consideration allocation is based on the SSP at contract inception. The consideration (net of any discounts) is allocated among separate products and services in a bundle based on their individual SSP. For contract modifications that add additional goods or services or changes pricing, the most recent SSP is used for allocation to the remaining performance obligations. The Company recognizes revenue for certain performance obligations at the point in time when control is transferred, such as delivery of products. The Company recognizes revenue for certain other performance obligations over a period of time as control of the goods or services is transferred, such as PCS and construction contracts. The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the Company expects the benefit of those costs to be longer than one year. The Company capitalizes incremental contract acquisition costs, and amortizes such costs over the period which the Company expects to benefit, which may extend beyond the initial contract term. Most of the Company’s contract costs are associated with its internal sales force compensation program and a portion of its employee bonus program. The Company amortizes capitalized bonuses and a portion of sales commissions over a period of five years commencing upon the initial transfer of control of the system to the customer. The pattern of amortization is commensurate with the pattern of transfer of control of the performance obligations to the customer. The Company elected to use the practical expedient in ASC 340-40-25-4 and expense as incurred commissions related to service renewals and upgrades because the contract term is less than a year.

The Company and its Significant Accounting Policies (Policies)

9 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant inter-company transactions and balances have been eliminated in consolidation.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles (“GAAP”), pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures have been condensed or omitted pursuant to such rules and regulations. The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair presentation of the periods presented. The results for the three and nine months ended March 31, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending June 30, 2019, or for any other future interim period or fiscal year.

These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and accompanying notes for the fiscal year ended June 30, 2018 included in the Company’s Annual Report on Form 10-K filed with the SEC on August 24, 2018.

Significant Accounting Policies

The Company adopted Accounting Standard Codification (“ASC”) 606, Revenue from Contracts with Customers as of July 1, 2018, using the modified retrospective method. See Note 2. Recent Accounting Pronouncements and Note 3. Revenue, to our unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q for additional details. Except for the changes in the revenue recognition policy, there have been no other material changes to the Company’s accounting policies from the information provided in Note 1. The Company and its Significant Accounting Policies to the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended June 30, 2018.

Revenue Recognition

The Company’s revenue is primarily derived from sales of CyberKnife and TomoTherapy Systems and services, which include post-contract customer support (“PCS”), installation services, training and other professional services.

The Company has a contract with a customer when there is approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable.

The Company's revenues are measured based on consideration specified in the contract with each customer, net of any sales incentives and amounts collected on behalf of third parties such as sales taxes, excise taxes, and VAT.

The majority of the Company's revenue arrangements consists of multiple performance obligations, which can include system, upgrades, installation, training, services, construction, and consumables. For bundled arrangements, the Company accounts for individual products and services separately if a product or service is separately identifiable from other items in the bundled package and if a customer can benefit from it on its own or with other resources that are readily available to the customer.

The Company’s products are generally not sold with a right of return, and the Company’s contracts generally provide a fixed transaction price. However, the Company from time to time offers variable consideration such as volume discounts. The Company also from time to time offers extended payment terms beyond one year, trade-in allowance for old systems, and commissions or other forms of payment to customers. The Company applied the practical expedient to not adjust for a significant financing component if the gap between payment and delivery was expected, at the contract inception, to be less than one year.

The stand-alone selling price (“SSP”) of performance obligations is determined based on observable prices at which the Company separately sells the products and services. If the SSP is not directly observable, then the Company will estimate the SSP considering market conditions, entity-specific factors, and information about the customer or class of customer that is reasonably available. The SSP is generally assessed as a percentage of the list price. The contract consideration allocation is based on the SSP at contract inception. The consideration (net of any discounts) is allocated among separate products and services in a bundle based on their individual SSP. For contract modifications that add additional goods or services or changes pricing, the most recent SSP is used for allocation to the remaining performance obligations.

The Company recognizes revenue for certain performance obligations at the point in time when control is transferred, such as delivery of products. The Company recognizes revenue for certain other performance obligations over a period of time as control of the goods or services is transferred, such as PCS and construction contracts.

The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the Company expects the benefit of those costs to be longer than one year. The Company capitalizes incremental contract acquisition costs, and amortizes such costs over the period which the Company expects to benefit, which may extend beyond the initial contract term. Most of the Company’s contract costs are associated with its internal sales force compensation program and a portion of its employee bonus program. The Company amortizes capitalized bonuses and a portion of sales commissions over a period of five years commencing upon the initial transfer of control of the system to the customer. The pattern of amortization is commensurate with the pattern of transfer of control of the performance obligations to the customer. The Company elected to use the practical expedient in ASC 340-40-25-4 and expense as incurred commissions related to service renewals and upgrades because the contract term is less than a year.