Concentration of Credit Risk and Significant Customers - (Details) - USD ($) $ in Thousands	3 Months Ended			8 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2019
Concentration Risk
Revenue	$ 106,852		$ 109,067		$ 342,514	$ 339,064
Minimum
Concentration Risk
Terms of credit sales, (in days)					30 days
Maximum
Concentration Risk
Terms of credit sales, (in days)					60 days
Huawei | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total							2.00%
Huawei | Minimum | Revenue | Customer Concentration Risk
Concentration Risk
Revenue				$ 11,000
Huawei | Maximum | Revenue | Customer Concentration Risk
Concentration Risk
Revenue				$ 13,000
Customer A | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	27.50%		26.80%		29.20%	28.40%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		12.10%
Customer B | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	36.40%		36.20%		36.20%	37.30%
Customer B | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	22.30%	19.70%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	22.30%	18.10%
Customer D | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		13.30%