Concentration of Credit Risk and Significant Customers - (Details) - USD ($) $ in Thousands			3 Months Ended		8 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2019
Concentration Risk
Revenue			$ 151,551	$ 117,802
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			28.80%	28.80%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	10.50%
Customer B | Revenue | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total			33.10%	35.10%
Customer B | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	18.80%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	25.60%	29.80%
Customer E | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		20.10%
Customer F | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		10.40%
Customer G | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		10.30%
Customer H | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		10.90%