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Revenue Recognition
 12 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Revenue Disaggregation
Revenue consisted of the following (in thousands):
Fiscal Year Ended March 31,
202320222021
Subscription$389,739 $319,298 $192,256 
Other29,313 24,250 14,641 
Total revenue$419,052 $343,548 $206,897 
Contract Balances
Changes in the Company’s deferred revenue balances were as follows (in thousands):
As of March 31,
20232022
Beginning balance$84,985 $83,492 
Additions, net, during the period439,503 345,041 
Revenue recognized from the beginning balance(83,231)(82,534)
Revenue recognized from contracts invoiced during the period(335,821)(261,014)
Ending balance$105,436 $84,985 
Included in the additions, net, during the period was $2.9 million of additions due to the AMiON acquisition which closed on April 1, 2022. See Note 8 — Business Combinations for additional information.
The Company’s unbilled revenue balances were $2.2 million and $1.4 million as of March 31, 2023 and 2022, respectively.
Deferred Contract Costs
The Company capitalized $8.5 million, $9.6 million, and $9.4 million of contract acquisition costs for the fiscal years ended March 31, 2023, 2022, and 2021, respectively. Amortization of deferred contract costs was $8.8 million, $9.8 million, and $6.9 million for the fiscal years ended March 31, 2023, 2022, and 2021, respectively. Deferred contract costs are periodically analyzed for impairment. There were no impairment losses relating to deferred contract costs during the fiscal years ended March 31, 2023, 2022, and 2021.